Portable pneumatic tool.



E. I. DODDS.

PORTABLE PNBUMATIG TOOL.

APPLIGATION FILED 11111.22, 1913.

1,090,603, PatentedvMar; 17, 1914.

MTA/5555: y W5/v To@ Y I' MOQM l' To all whom itv may concern UNITED sTATEs PATENT onirica ETHAN I. Dobbs, oF CENTRAL EAGTUEING GoMPANY, or PENNSYLVANIA.

j Beit known that I, ETHAN lI. Donns, a citizen of the UnitedStates, residing at Central Valley, in the county ot' Orange and State of New York, have invented a new vand useful Im l)rm-ement lin Portable lneumatic Tools, of which the following is a` full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specilication, in which*- Figure l is an end elevation partly broken away of a tool embodying my invention;

2 is a longitudinal vertical section of thje'same; Fig. 3 is a transverse vertical section on theline IIL-III of Fig. 2; Fig. 4 is 'a section on the line IV -IV of Fig. `2; Fig. `5 is a sideelevation; and Fig. 6\is an end elevation looking at the opposite endfrom Fig.l. 7.,. i

Mv invention has relation `to portable pneumatic tools, and is designedto provide a. simple, convenient. and compact form ot top ol wliichmay be use-d for a varietyof purposes. Y l1- l The nature of my invention will be'bcst understood by reference to the acco1npanying drawings. in which I have shown the preferred embodimentA thereof and which will now be' described, it being premised. however, that various changes mayl be made in the details of construction andl arrangevment of the Several parts, without departing from the spirit 4and scope of my invention, as defined in the appended claims.

In these drawings, the numeral 2 designates the handle portion ofl the tool, which is vshaped at 2 to form the grasp for the hand.

This portion 2` is made hollow to form the -conduit 8, by means' of which the motive'tiuid is led into the motor chamber 4 of the tool.

" The lower end of the conduit 3 where it opens through the base of the handle portion is shown as interiorly threaded at 5, for the attachment thereto of a supply pipe or hose. .Ibe upper member of the handle portion 2 has the depending lbarrel 4part 6, formed with a vertical conduit` or port. 7, which communicates at its upper end with the conduit :3 and at its lower end with the motor eha1nher 4. A- valve seat 8 is formed at the junction ot' the ports or conduits 3 and7 to seat a rotary valve 9. This valvehas a. projecting stein 10 at 'one end to which is .ittached 'valve in the closed lcontain any suitable port or conduit T opens 'PORTABLE PNEUMATIG T0011.`

Patented Mar. 17, 1914.

v El.; a lever 11, one arm of which extends in. osi# `tion `to be lreadily pressed by thc'thum for 55 finger 'when the `tool is grasped by' the hand,-, and to-the other a'rrn ot' which is attached a spring 11, which acts to normally hold'the position shown in Fig'Q. The motor ehamber'd is formed in afc'y- 60 lindrieal portion 12 ot' the frame at the lower,=. end of the barrel part G. and is'designedmto iorni of rotary i In the device illustrated in the drawin,v have shown the motor chamber as provide with two parallel pieton shafts 13, each of which carries two rotary pistons 1st, of intermeshing or intergearing type. The

into the motor clnttrn-l bei' 4. intermediate the two shafts 13a1ntl 70 the motive fluid t li\'ides,being compelled'fto actuate the pistons and their respective shafts in order to reach the exhaust ports These two ports are prelt'erablyv onnectedfhy an equalizing port or passage 1G. 75 One of the shafts 13 carries a toothed ion 17. theteeth ot whichv mesh with the teeth of a gear wheel 19. which is attached to or Carries a tool`spimlle 19, hating a chuck Q0, in which any suitable formot tool such as a drill or auger, may be secured;V The pinion 17 and gear wheel 1S are inl-f closed byl a detachable cap 21, secured `to the. forward portion Q2 of the frame, saidv cap '2l being provided with suitable bearings 85 tor the extended ends of the shafts 13. This cap is also provided with a suitable bearing Q for the tool spindle 19. The gear wheel 1S is preferably provided with the tail-bearing spindle 2i, and with a. combined thrust4 90 .and antitriction bearing- 25, for taking the back thrust of the tool spindle.

My invention provides a simple and elli# cient form of pneumatic too'l which can be readily grasped in the hand and held and manipulated at different angles, and which may be used for a variety of different purposes. While I refer to use compressed air as a motive uid, I do not necessarily limit myself thereto, as water or steam maiy be employed as the motive tiuid. Itwil also be understood that the particular type of motorl vemployed may be varied, that shown bein illustrative only.

If desire the frame may be provided with perforated lugs lo r foot portions 26, by

means of which it can be fixed to a suitable base in case it should .be desired to use the tool in this manner.

I claim 1. A tool of the character described, comprising a frame, there being a motor chamber Within said frame, a plurality of intery'geared pistons rotatably mounted in said chamber, there being an inlet conduit leading to said chamber, shafts to which the pistons are attached, a tool spindle out of alinea longitudinall ment with the piston shafts, and gearingconnecting one of said 4piston shafts With a bool shaft; substantially as described.

2. A tool of the character described, comprising a handle portion having an` inlet conduit, a motor chamber carried by the handle portion, a casing connected to the front and of said handle portion, a plurality of shafts rotatably mounted in the han- .dle portion and the gear casing, there being .a piston chamber within the handle portion Y. 8. A portable tool of the character described, `comprising a frame portion having v extending piston chamber therein, there eing a conduit leadin to the piston chamber and a plurality o ezihaust ports leading' from the piston cha-mber, a gear casing connected to the front end of said frame portion, a. plurality of shafts rotatablymounted in the frame portion and the gear casing and extending through the piston chamber, a plurality of inter-geared pistons in the piston chamber connected to .said shafts, a tool spindle out ofalinement an inlet conduit leading through the handle portion and the frame portion to the piston chamber, a plurality of exhaust ports leading from the cylinder chamber to the atmosphere, a valve for controlling lthe admission of fluid to the piston chamber, va tool spindle bearing seat in said frame p0rtion, a gear frame connected to the front end of the handle-frame havin@` bearings for the motor and the tool spindle, and gearing Within Vsaid casing connecting the motor and the spindle; substantially asdescribed.

In testimony whereof, I have hereunto set my hand.

ETHAN I.- DODDS. Witnesses: l

Gro. B. BLEMING, GEO. H. PARMELEE. 

